Improvement in file-cutting machines



UNITED STATES PATENT OFFICE.

JAMES JERVIS, OF BALTIMORE, MARYLAND.

IMPROVEMENT IN FILE-CUTTING `MACHINES.

Specification forming part of Letters Patent No. 50,595, dated October 24, 1865.

To all whom it may concern.-

Beit known that I, JAMES JERVIS, of the city of Baltimore, in the State of Maryland, have invented a new and useful Improvement in Machines for Cutting Files; and I hereby declare that the following-is a full and exact description thereof, reference being had to the accompanying drawings.

By referring to the specification attached to Letters Patent'of the United States granted to me on the 11th October, 1864, for an improvement in machines for cutting files, it will be seen that I describe what I term a regulator,7 whose office is to keep the shape steady ortlrm upon the bed-piece at the stroke of the chisel, while at the same time it performs other important functions.

My present improvement is in the form and construction of the regulator, and in the parts of the machine on which it operates.

Instead of making the regulator of a single piece set at an angle, the lower edge bearing upon the shape, I make it of several pieces and set it nearly perpendicular, as shown in the accompanying drawings, where- Figure 1 represents afront and Fig. 2 a side view ofthe regulator, A being the body, so called by me, of the regulator, recessed or mortised at its lower end to receive the adjustable section B, to which is hinged the presser a, the body, adjustable section, and presser forming together the regulator. D is the shape, with the presser in contact with it, and the dotted lines show the chisel m.

The form of the several parts of the regulator is shown in the drawings, where it will be seen that the adjustable section, to which the presser ishinged or attached, maybe moved forward or drawn back at pleasure. This becomes important, because in cutting a small tile a smaller chisel is used than where a large and coarse le is to be cut, and it is important in both cases to place the regulator close to the chisel, which is done by advancing or withdrawing the regulator, as the case may be. The arrangementlusefor this purpose is shown in Fig. 2, which represents the adjustable section Bat the lower end of the regulator-body A. 1 is a bolt or spindle, with shoulders turned on it at 6 and 7. 3 is a hollow bolt screwed into the body of the regulator, through which the spindle passes. On the outside of this hollow bolt is an adjusting-nut, 4, and at the end ot' the spindle is another adjusting-nut, 5. lt will now be seen that by screwing up the hollow bolt 3 it is made to press on the shoulder 2 ofthe adjustable section, which is advanced thereby, and retained in its position by the nut 4. Io draw the adjustable section back, the hollow bolt 3 is unscrewed sufficiently and the nut 5 screwed up, which draws'back the adjustable section' by the pressure of the head ot' the bolt or spindle l on the shoulder 6.

The position of the adjustable section is regulated laterally by the set-screws l) b, so as to enable the operator to keep the lower surface of the presser at all times parallel with the edge of the chisel.

,It will be seen, ou inspection ofthe drawings, that the presser is connected with the adjustable section at the hinge-joint by the links o o, and that it (the presser) is thus kept with its flat surface in contact with the shape, as well at the place where the sides of the shape are parallel as where there is ataper, as shown by dotted line, Fig. 2.

It will readily be seen that by omitting the adjustable section I might attach the presser to the body of the regulator, but, although a useful effect would 'be obtained thereby, it would be less than where the adjustable section is employed.

It will be observed that the regulator here described may be applied to all tile-machines as well as to that for which I hold Letters Pat ent, as aforesaid. By referring to my said Letters Patent it will be seen that I describe a bed-piece, U, 011 which the shape is placed, and which has a rotation at right angles with itslength to compensate for inequalities of the surface. of the shape as well as to enable the chisel to make a uniform cut across the shape when the edge of the chisel is not perfectly horizon tal, owing to its grinding or other cause; and it will be observed that this rotation is governed by the pressure of the regulator on the surface of the shape.

It beoomesimportant to secure, as far as practicable, a uniform result oirotation, as the shape passes under the chisel and regulator, and if the shape were always ofthe same width this uniformity would exist; but the shapes are generally tapering, and in three cornered or taper saw-files the taper is very great, andin the last case,wl1ile the power ot the regulator to cause the bed-piece to revolve or rotate is great, being in proportion to the Width at the widest part of the tile, yet at the point ofthe tile where the surface ofthe shape is very narrow it is proportionally small, and may not be sut'- iicient to produce anyrotation Whatever,where byit might happen that the cut across the face ot' the shape would be deeper on 011e side than on the other. To obviate this and enable the regulator to exercise the same power, whether the surface to be cutis wide or narrow, I make the bed-piece tapering as the taper of the Inosttaper tile to be cut by the machine. ln this Way I reduce the surface, the friction of which is to be overcome by the action of the regulator, making the friction proportionate to the taper of the shape.

In the accompanying drawings, Fig. 3 represents the anvil, with the tapering groove in which the bed-piece rests at Q Q; and R the bed-piece, with the groove for the shape to rest in.

What I claim las new, and desire to secure by Letters Patent, is

1. The combination of the body of the regulator with the adjustable section B connected therewith, substantially as described, Whether the -latter presses directly upon the shape or through the intervention of the presser a.

2. The combination of the body of the regulator, the adjustable section, and the presser a, hinged to the latter, substantially as described.

3. Giving to the rotatingbed a taper whereby the ability ot' the regulator to cause the rotation ot the bed is made comparatively uniform throughout, and this Whether the same bed is used for all shapes or a separate bed is provided for each shape or description ot file.

JAMES JERVIS. Witnesses:

JNO. H. B. LA'rRoBE, GHAs. E. WATERS.

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